PDF malware analysis — malicious · b5cc9ffb933d7d37

MALICIOUS

PDF

67.8 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: wwbogan (via ctgxplu)

MD5: fcdc5404561dde89212857eccb083b14 SHA-1: 9aa8d6e1ac0a8c3507a2d306540ac62ff0e672e6 SHA-256: b5cc9ffb933d7d370bf98ca9232741b02c9c30d66383b54153bba27578167f33

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript that utilizes the unescape function and targets the AcroForm marker to exploit CVE-2007-5659. This exploit is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. No specific family could be identified, but the exploit and stager mechanism are clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 8

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
AcroForm marker-unescape JavaScript stager high PDF_ACROFORM_MARKER_UNESCAPE_JS_STAGER

PDF OpenAction JavaScript reads an AcroForm field value, rewrites a long marker token back to percent escapes, then unescape/eval executes the recovered exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`acroform_marker_stage_000.js` `b20c6509528ba81ff56b233efa14b0836bcdf9aa691b154a1e3451b8252d11c7`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x416	3768 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `e514d3945e6558ce4567b07a98e33f3750d75a55c26d164a3f57c74a8fe7c0dc`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10D86	205 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `e46f2c461bba3fbd208f3bfea6699c4a60973a686284595be2d1084998059686`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10DA7	366 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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